Convertible swaddle and sleeping sack in one- Swaddle for babies of 0 - 9 months / 5 - 24 lbs- Doubles as a sleeping sack for use up to 18 months- Arms can transition out after 3 months or when baby is rolling- Woombie's products have been deemed “hip-healthy” by the International Hip Dysplasia Institute- Each Woombie Grow with Me Swaddle 5 Stages is HKD 385.00 / TWD 1,500.00